US4006801A - Automatic slack adjusters for vehicles - Google Patents

Automatic slack adjusters for vehicles Download PDF

Info

Publication number
US4006801A
US4006801A US05/618,226 US61822675A US4006801A US 4006801 A US4006801 A US 4006801A US 61822675 A US61822675 A US 61822675A US 4006801 A US4006801 A US 4006801A
Authority
US
United States
Prior art keywords
ratchet member
parts
brake applying
vehicle brake
brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/618,226
Other languages
English (en)
Inventor
John Patrick Bayliss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Girling Ltd
Original Assignee
Girling Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Girling Ltd filed Critical Girling Ltd
Application granted granted Critical
Publication of US4006801A publication Critical patent/US4006801A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/38—Slack adjusters
    • F16D65/40—Slack adjusters mechanical
    • F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
    • F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
    • B61H15/00—Wear-compensating mechanisms, e.g. slack adjusters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F16D2121/26—Electric or magnetic using motors for releasing a normally applied brake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/48—Rotating members in mutual engagement with parallel stationary axes, e.g. spur gears

Definitions

  • the load transmitting assembly incorporates first and second parts which are relatively movable in an axial direction between an advanced position in which the sum length of the parts is at a maximum value and a retracted position in which the sum length of the parts is at a minimum value shorter than the maximum value, a first pair of abutment surfaces being in engagement in said advanced position and being spaced apart in said retracted position, and a second pair of abutment surfaces being spaced apart in said advanced position and being in engagement in said retracted position, and resilient means acts between the first and second parts normally to urge the first and second parts into the advanced position to take up slack and maintain friction pads of a braking mechanism spaced from a rotatable braking member by a distance comprising the braking clearances determined by the adjust
  • the first portion comprises a nut which is held against rotation and the second portion comprises an adjuster screw.
  • the adjuster screw may comprise the first and second parts which are relatively movable in an axial direction to affect separation of the ratchet members when the brake is applied and after compression of the spring acting normally to hold the abutment surfaces of the parts in a spaced relationship whereby rotation of the second ratchet member with the spindle is not transmitted to the first ratchet member until the abutment faces of the parts are again in the said spaced relationship with the load in the spring being at least equal to a brake reaction load.
  • the pitch of the thread of the spindle is the same as that between the nut and the adjuster screw and adjustment takes place when the angular movement of the drive pin engages with the opposite end of the recess in the first ratchet member before the carrier has engaged with a backstop defining its retracted position.
  • FIG. 1 is a plan incorporating part of a longitudinal section through a spring-operated brake actuator incorporating an automatic slack adjuster;
  • a spring carrier 1 guided for axial movement in a housing 2 is moved axially of the housing to apply a brake applying load to a clevis 3 attached to a braking mechanism.
  • the carrier 1 is moved axially in a brake applying direction by the release of energy in a spring assembly 4 which surrounds a central hub 5 of the carrier 1 and comprises a series of plate springs or Belleville washers 6.
  • the spring assembly is held in a compressed energy storing position by means of a ball nut 7 which is coupled to the carrier 1 and an axially fixed ball screw 8 which is adapted to be rotated through a reduction gearing 9 by an electric motor 10.
  • the electric motor and the reduction gearing need not be described further as they are incorporated in the brake which forms the subject of our co-pending patent application Ser. No. 618,227 of even date.
  • the carrier 1 acts on the clevis 3 through an automatic slack adjuster 11.
  • the slack adjuster 11 comprises an adjuster nut 12 which is rigidly fixed to the carrier 1 and extends in a direction opposite to the hub 5.
  • the pitch of the thread in the nut 12 is the same as that of the fixed ball screw 8.
  • An adjuster screw 13 is threadably engaged within the nut 12 and acts on a ram 14 through a compression spring 15 and a spring carrier 16 which forms an abutment for the spring 15 and acts on the ram 14.
  • the ram 14 incorporates a rearwardly directed extension 17 of reduced diameter which extends through and is keyed to the screw 13 against relative rotation by means of a key 18.
  • An eccentrically mounted pin 26 projects from the screw 13 into a recess 27 in the ratchet member 22 to limit rotation of the ratchet member 22 with respect to the extension 17 through an angular distance corresponding to the circumferential length of the recess 27.
  • a torsion return spring 28 urges the ratchet member 22 at all times in a direction in which a wall at one end of the recess 27 is engaged with the pin 26.
  • a clutch housing 29 is rotatably mounted on a plain portion 30 at the free end of the ball screw 8, between a shoulder 31 and a circlip 32, and the housing 29 is coupled to the portion 30 by means of a one-way roller clutch 33.
  • the clutch housing 29 is slidably keyed to the ratchet member 20 for relative axial movement in both directions by means of a key 34.
  • the voltage to the motor 10 is reduced so that the energy in the spring assembly 4 is released and urges the carrier 1 towards the end of the housing 2 from which the clevis 3 extends.
  • the force from the spring assembly 4 being is transmitted to the clevis through the carrier 1 the nut 12, the screw-threads, the adjuster screw 13, the spring 15, the carrier 16 and the ram 14.
  • the initial movement of the clevis 3 takes up clearances.
  • the spring 15 is compressed to allow an abutment face 45 on the carrier 16 to engage with a complementary face 46 on the adjuster screw 13, thereby applying the full force of the spring assembly 14 to the clevis.
  • the compression of the sensing spring 15 causes the teeth on the ratchet member 22 to separate from the teeth on the ratchet member 20.
  • the carrier 5 will have reached its backstop defined by an engagement with a fixed abutment face 47 in the housing 2. Thus no further rotation of the ratchet members 20 and 22 will take place.
  • the forward movement of the carrier 5 and the ram 14 is excessive when the brake is applied, in order to compensate for wear of the friction pads and deflections of linkages in the braking mechanism the effective length of an assembly comprising the nut 12, the screw 13, and the ram 14 is increased when the brake is released.
  • the ratchet assembly In addition to permitting the ram 14 to rotate with respect to the clevis 3, the ratchet assembly also prevents undesirable rotation of the ram 14 due to vibrations. Also the ratchet assembly permits the slack adjuster to be wound back without having to disconnect the clevis 3 from the brake mechanism. This is achieved by engaging a suitable spanner with the ram 14 and rotating the ram to reduce the effective length of the said assembly comprising the nut 12, the screw 13, and the ram 14. Only the torque required to make the ratchet member 22 rotate with respect to the ratchet member 20 is transmitted to the motor 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)
US05/618,226 1974-10-16 1975-09-30 Automatic slack adjusters for vehicles Expired - Lifetime US4006801A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB44743/74A GB1491485A (en) 1974-10-16 1974-10-16 Vehicle brake applying means incorporating automatic slack adjusters
UK44743/74 1974-10-16

Publications (1)

Publication Number Publication Date
US4006801A true US4006801A (en) 1977-02-08

Family

ID=10434564

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/618,226 Expired - Lifetime US4006801A (en) 1974-10-16 1975-09-30 Automatic slack adjusters for vehicles

Country Status (7)

Country Link
US (1) US4006801A (ja)
BE (1) BE834554A (ja)
CH (1) CH621300A5 (ja)
CS (1) CS209849B2 (ja)
DE (1) DE2546402C2 (ja)
FR (1) FR2288249A1 (ja)
GB (1) GB1491485A (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175645A (en) * 1977-03-11 1979-11-27 Raco-Elektro-Maschinen Gmbh Electrically resettable railway brake
US5957246A (en) * 1996-12-26 1999-09-28 Akebono Brake Industry Co., Ltd. Electric brake including a pad clearance adjusting mechanism and a method for adjusting the pad clearance of the same
US5979257A (en) * 1997-12-01 1999-11-09 Chrysler Corporation Automated manual transmission mode selection controller
US5984068A (en) * 1997-12-01 1999-11-16 Chrysler Corporation Electro-mechanical clutch actuator
US5993350A (en) * 1997-12-01 1999-11-30 Lawrie; Robert E. Automated manual transmission clutch controller
US6006620A (en) * 1997-12-01 1999-12-28 Chrysler Corporation Automated manual transmission controller
US6019698A (en) * 1997-12-01 2000-02-01 Daimlerchysler Corporation Automated manual transmission shift sequence controller
WO2003082649A1 (de) * 2002-04-03 2003-10-09 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Bremszuspanneinrichtung mit elektrisch betätigter verschleissnachstell- und not- und hilfslöseeinrichtung
WO2003082650A1 (de) * 2002-04-03 2003-10-09 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Bremszuspanneinrichtung mit elektrisch betätigtem verschleissnachsteller

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1491486A (en) * 1975-09-22 1977-11-09 Girling Ltd Brake actuators for vehicles
IN161426B (ja) * 1983-05-12 1987-11-28 Westinghouse Brake & Signal
IN160902B (ja) * 1983-05-12 1987-08-15 Westinghouse Brake & Signal
DE3423510A1 (de) * 1984-06-26 1986-01-02 Knorr-Bremse GmbH, 8000 München Elektromechanische betaetigungseinrichtung fuer eine scheibenbremse von fahrzeugen, insbesondere schienenfahrzeugen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467228A (en) * 1966-08-13 1969-09-16 Dunlop Co Ltd Automatic adjusting device for use in brakes
US3659683A (en) * 1969-04-25 1972-05-02 Rudolf Betzing Electromechanical shifting device
US3682279A (en) * 1970-03-09 1972-08-08 Wehr Corp Brake actuating mechanism for rapid take up of running clearance and gradual application of brake setting force
US3822772A (en) * 1972-03-10 1974-07-09 Daikin Mfg Co Ltd Clutch disc releasing spring with automatic wear compensator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1475466C3 (de) * 1964-04-25 1974-03-28 Gebr. Scholten, 4100 Duisburg Selbsttätige Nachstellvorrichtung für ein BremsbetätigungsgeräL

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467228A (en) * 1966-08-13 1969-09-16 Dunlop Co Ltd Automatic adjusting device for use in brakes
US3659683A (en) * 1969-04-25 1972-05-02 Rudolf Betzing Electromechanical shifting device
US3682279A (en) * 1970-03-09 1972-08-08 Wehr Corp Brake actuating mechanism for rapid take up of running clearance and gradual application of brake setting force
US3822772A (en) * 1972-03-10 1974-07-09 Daikin Mfg Co Ltd Clutch disc releasing spring with automatic wear compensator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175645A (en) * 1977-03-11 1979-11-27 Raco-Elektro-Maschinen Gmbh Electrically resettable railway brake
US5957246A (en) * 1996-12-26 1999-09-28 Akebono Brake Industry Co., Ltd. Electric brake including a pad clearance adjusting mechanism and a method for adjusting the pad clearance of the same
US6019698A (en) * 1997-12-01 2000-02-01 Daimlerchysler Corporation Automated manual transmission shift sequence controller
US5984068A (en) * 1997-12-01 1999-11-16 Chrysler Corporation Electro-mechanical clutch actuator
US5993350A (en) * 1997-12-01 1999-11-30 Lawrie; Robert E. Automated manual transmission clutch controller
US6006620A (en) * 1997-12-01 1999-12-28 Chrysler Corporation Automated manual transmission controller
US5979257A (en) * 1997-12-01 1999-11-09 Chrysler Corporation Automated manual transmission mode selection controller
US20050155825A1 (en) * 2002-04-02 2005-07-21 Erich Fuderer Brake application device comprising an electrically actuated wear-adjusting emergency release and auxiliary release device
WO2003082649A1 (de) * 2002-04-03 2003-10-09 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Bremszuspanneinrichtung mit elektrisch betätigter verschleissnachstell- und not- und hilfslöseeinrichtung
WO2003082650A1 (de) * 2002-04-03 2003-10-09 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Bremszuspanneinrichtung mit elektrisch betätigtem verschleissnachsteller
US20060070830A1 (en) * 2002-04-03 2006-04-06 Erich Fuderer Brake application device comprising an electrically actuated wear adjuster
US7419035B2 (en) 2002-04-03 2008-09-02 Knorr-Bremse Systeme für Schienenfahreuge GmbH Brake application device comprising an electrically actuated wear-adjusting emergency release and auxiliary release device
US7523813B2 (en) 2002-04-03 2009-04-28 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Brake application device comprising an electrically actuated wear adjuster

Also Published As

Publication number Publication date
GB1491485A (en) 1977-11-09
BE834554A (fr) 1976-02-02
FR2288249B1 (ja) 1980-12-05
CS209849B2 (en) 1981-12-31
CH621300A5 (ja) 1981-01-30
DE2546402A1 (de) 1976-04-22
FR2288249A1 (fr) 1976-05-14
DE2546402C2 (de) 1985-11-07

Similar Documents

Publication Publication Date Title
EP0125873B1 (en) Electric actuators
US4033435A (en) Retainer mechanism for vehicle brake actuators
US6276494B1 (en) Brake wear sensor
US4546297A (en) Electric actuators
US4006801A (en) Automatic slack adjusters for vehicles
HU181319B (en) Brake lever for automatically adjusting drum brake
US4351419A (en) Automatic slack adjuster
US3966028A (en) Automatic brake adjusting mechanism
US3835961A (en) Disk type brake
US3211263A (en) Adjuster for vehicle brakes
US4394890A (en) Automatic slack adjuster
US3995722A (en) Fail-safe disc brake having a slack adjuster mechanism
US4378863A (en) Automatic adjuster for hydraulic brake actuator
JPS5928783B2 (ja) 車両用ブレ−キのアクチュエ−タ
JPS61175330A (ja) レール車両用デイスクブレーキのためのブレーキリンク機構
US4088205A (en) Brake cylinder with built-in slack adjuster, including means for manually resetting piston travel
US3621947A (en) Vehicle drum brakes and adjusting means therefor
US3378109A (en) Disc brake assembly
US3726367A (en) Combined service and parking brake
US3850269A (en) Slack adjuster
US4026394A (en) Vehicle shoe-drum brakes of the duo-servo type
US4623046A (en) Automatic adjuster for duo-servo internal shoe drum brakes
US4113070A (en) Brake actuator
US4234064A (en) Slack adjuster means
US4926980A (en) Automatic brake adjusting mechanism